AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
if (sar.num == 0) {
/* I assume this means that we don't know */
- return optional<double> ();
+ return {};
}
return double (sar.num) / sar.den;
}
string
FFmpegExaminer::subtitle_stream_name (AVStream* s) const
{
- string n = stream_name (s);
+ auto n = stream_name (s);
if (n.empty()) {
n = _("unknown");